Enabling Self-passivation by Attaching Small Grains on Surfaces of Large Grains toward High-Performance Perovskite LEDs

Jiajun Qin; Jia Zhang; Y. Bai; Shengbo Ma; Miaosheng Wang; Hengxing Xu; Matthew Loyd; Yiqiang Zhan; Xiaoyuan Hou; Bin Hu

doi:10.1016/j.isci.2019.07.044

Enabling Self-passivation by Attaching Small Grains on Surfaces of Large Grains toward High-Performance Perovskite LEDs

Jiajun Qin, Jia Zhang, Y. Bai, Shengbo Ma, Miaosheng Wang, Hengxing Xu, Matthew Loyd, Yiqiang Zhan, Xiaoyuan Hou, Bin Hu

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

This paper reports a new method to generate stable and high-brightness electroluminescence (EL) by subsequently growing large/small grains at micro/nano scales with the configuration of attaching small grains on the surfaces of large grains in perovskite (MAPbBr₃) films by mixing two precursor solutions (PbBr₂ + MABr and Pb(Ac)₂·3H₂O + MABr). Consequently, the small and large grains serve, respectively, as passivation agents and light-emitting centers, enabling self-passivation on the defects located on the surfaces of light-emitting large grains. Furthermore, the light-emitting states become linearly polarized with maximal polarization of 30.8%, demonstrating a very stable light emission (49,119 cd/m² with EQE = 11.31%) and a lower turn-on bias (1.9 V) than the bandgap (2.25V) in the perovskite LEDs (ITO/PEDOT:PSS/MAPbBr₃/TPBi[50 nm]/LiF[0.7 nm]/Ag). Therefore, mixing large/small grains with the configuration of attaching small grains on the surfaces of large grains by mixing two precursor solutions presents a new strategy to develop high-performance perovskite LEDs.

Original language	English
Pages (from-to)	378-387
Number of pages	10
Journal	iScience
Volume	19
DOIs	https://doi.org/10.1016/j.isci.2019.07.044
State	Published - Sep 27 2019
Externally published	Yes

Funding

This research was supported by Air Force Office of Scientific Research (AFOSR) under the Grant no. FA 9550-15-1-0064 , AOARD ( FA2386-15-1-4104 ), the Homeland Security ( DHS-16-DNDO-077-001 ), and National Science Foundation ( NSF-1911659 ). This research was partially conducted at the Center for Nanophase Materials Sciences based on user projects ( CNMS2012-106 , CNMS2012-107 , CNMS-2012-108 ), which is sponsored by Oak Ridge National Laboratory by the Division of Scientific User Facilities , U.S. Department of Energy . The author (J.Q.) was supported by China Scholarship Council (CSC: 201606100126 ). This research was supported by Air Force Office of Scientific Research (AFOSR) under the Grant no. FA 9550-15-1-0064, AOARD (FA2386-15-1-4104), the Homeland Security (DHS-16-DNDO-077-001), and National Science Foundation (NSF-1911659). This research was partially conducted at the Center for Nanophase Materials Sciences based on user projects (CNMS2012-106, CNMS2012-107, CNMS-2012-108), which is sponsored by Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy. The author (J.Q.) was supported by China Scholarship Council (CSC: 201606100126). Conceptualization and Methodology, J.Q.; Investigation, J.Q. J.Z. Y.B. S.M. H.X. M.W. and M.L.; Writing ? Original Draft, J.Q.; Writing ? Review & Editing, Y.Z. and B.H.; Supervision, B.H. and X.H. The authors declare no competing interests.

Funders	Funder number
Division of Scientific User Facilities
National Science Foundation	NSF-1911659
U.S. Department of Energy
U.S. Department of Homeland Security	DHS-16-DNDO-077-001
Air Force Office of Scientific Research	CNMS-2012-108, CNMS2012-106, CNMS2012-107
Oak Ridge National Laboratory
China Scholarship Council	201606100126

Keywords

Materials Characterization
Optical Materials
Surface

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title = "Enabling Self-passivation by Attaching Small Grains on Surfaces of Large Grains toward High-Performance Perovskite LEDs",

abstract = "This paper reports a new method to generate stable and high-brightness electroluminescence (EL) by subsequently growing large/small grains at micro/nano scales with the configuration of attaching small grains on the surfaces of large grains in perovskite (MAPbBr3) films by mixing two precursor solutions (PbBr2 + MABr and Pb(Ac)2·3H2O + MABr). Consequently, the small and large grains serve, respectively, as passivation agents and light-emitting centers, enabling self-passivation on the defects located on the surfaces of light-emitting large grains. Furthermore, the light-emitting states become linearly polarized with maximal polarization of 30.8%, demonstrating a very stable light emission (49,119 cd/m2 with EQE = 11.31%) and a lower turn-on bias (1.9 V) than the bandgap (2.25V) in the perovskite LEDs (ITO/PEDOT:PSS/MAPbBr3/TPBi[50 nm]/LiF[0.7 nm]/Ag). Therefore, mixing large/small grains with the configuration of attaching small grains on the surfaces of large grains by mixing two precursor solutions presents a new strategy to develop high-performance perovskite LEDs.",

keywords = "Materials Characterization, Optical Materials, Surface",

author = "Jiajun Qin and Jia Zhang and Y. Bai and Shengbo Ma and Miaosheng Wang and Hengxing Xu and Matthew Loyd and Yiqiang Zhan and Xiaoyuan Hou and Bin Hu",

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AU - Ma, Shengbo

AU - Wang, Miaosheng

AU - Xu, Hengxing

AU - Loyd, Matthew

AU - Zhan, Yiqiang

AU - Hou, Xiaoyuan

AU - Hu, Bin

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N2 - This paper reports a new method to generate stable and high-brightness electroluminescence (EL) by subsequently growing large/small grains at micro/nano scales with the configuration of attaching small grains on the surfaces of large grains in perovskite (MAPbBr3) films by mixing two precursor solutions (PbBr2 + MABr and Pb(Ac)2·3H2O + MABr). Consequently, the small and large grains serve, respectively, as passivation agents and light-emitting centers, enabling self-passivation on the defects located on the surfaces of light-emitting large grains. Furthermore, the light-emitting states become linearly polarized with maximal polarization of 30.8%, demonstrating a very stable light emission (49,119 cd/m2 with EQE = 11.31%) and a lower turn-on bias (1.9 V) than the bandgap (2.25V) in the perovskite LEDs (ITO/PEDOT:PSS/MAPbBr3/TPBi[50 nm]/LiF[0.7 nm]/Ag). Therefore, mixing large/small grains with the configuration of attaching small grains on the surfaces of large grains by mixing two precursor solutions presents a new strategy to develop high-performance perovskite LEDs.

AB - This paper reports a new method to generate stable and high-brightness electroluminescence (EL) by subsequently growing large/small grains at micro/nano scales with the configuration of attaching small grains on the surfaces of large grains in perovskite (MAPbBr3) films by mixing two precursor solutions (PbBr2 + MABr and Pb(Ac)2·3H2O + MABr). Consequently, the small and large grains serve, respectively, as passivation agents and light-emitting centers, enabling self-passivation on the defects located on the surfaces of light-emitting large grains. Furthermore, the light-emitting states become linearly polarized with maximal polarization of 30.8%, demonstrating a very stable light emission (49,119 cd/m2 with EQE = 11.31%) and a lower turn-on bias (1.9 V) than the bandgap (2.25V) in the perovskite LEDs (ITO/PEDOT:PSS/MAPbBr3/TPBi[50 nm]/LiF[0.7 nm]/Ag). Therefore, mixing large/small grains with the configuration of attaching small grains on the surfaces of large grains by mixing two precursor solutions presents a new strategy to develop high-performance perovskite LEDs.

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Enabling Self-passivation by Attaching Small Grains on Surfaces of Large Grains toward High-Performance Perovskite LEDs

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